Tunnel, furnace, kiln, oven, and the like



2 Sheets-Sheet 1 Aug. ll, 1925.K

Aug. 11, 1925. l 1,549,481

H. FRANCART TUNNEL, FURNACE, KILN, OVEN,I AND THE LIKE Filed June 24, 1920 2 Sheets-Sheet 2 l.. l l l n w/NVENTOH:

Patented Aug. 11, 1925.

Uhlif'l@ STATES HENRI FRANCART, OF TONGRES, BELGIUM.

TUNNEL, ETIBJSTACEL KILN, OVEN, AND THE LIKE.

Application filed June 24, 1920. Serial No. 391,511.

(tvRAlTEI) UNDER TILE PROVISIONS 0F THE ACT 0F MARCH 3, 1921, 41 STAT. L., 1313i.)

T 0 all whom t may con ccm Be it known that I, HENRI FRANGART, citizen of Belgium, residing at Tongres, Belgium, has invented certain new and useful Improvements in or Relating to Tunnels, Furnaces, Kilns, Ovens, and the like, of which the following is a specification.

The present invention. relates to the flame tunnel ovens wherein the articles under treatment are advanced between stationary walls and it has for one of its objects an improvement in an apparatus of this type whereby the output and the efficiency of the apparatus is increased.

It is also an object of this device to provide a tunnel oven in which the products of combustion and the flames therefrom come in direct contact with the article to be heated and also one in which radiation covers an important part.

This radiation produces effects which are all the more useful in that it helps to equalize and control the degree of heat at any point within the oven. This radiation is increased by the particular construction of the interior of the oven walls which are so arranged that the radiation will be localized and will act upon the articles opposite cavities formed by certain flange structure.l

Another feature of this device, is the peculiar construction of the flanges located within the oven whereby the displacement of the products of combustion through the tunnel is aided; other objects and advantages of this device will be apparent from the following description taken in connection with the drawing which shows one embodiment of my invention.

I do not wish however to be limited by the particular structure here shown.

In the drawings;

Fig. l, is a vertical cross-section of the preferred embodiment of my invention.

Fig. 2, is a longitudinal horizontal section.

Fig. 3, is a view showing a longitudinal section with the flanges inclined for the purpose of aiding in the displacement of the products of combustion.

Fig. 4, is a modified form in cross-section of an oven adapted to be used for anneal' purposes. if;

In the drawings, the numeral l, represents a conduit by which the gas is supplied to the oven. This conduit as shown in Figure l leads into each side of the oven. The gas from the conduit l enters within the oven proper through cavities 2 at the bottom of the oven on each side thereof. These cavities 2 lead into the oven between flanges 3, which extend all the way across the upper part of the oven and serve to localize the heat produced by the combustion of the gas andwhich also serve to produce radiating surfaces. The lower part of the flanges just above point of entrance of the gas into the oven proper is hollowed out to form conduits 5 for placing the cavities formed by the fianges in communication with each other.

Within suitable space through the oven there is provided a trackway on which trucks l containing the articles to be treated are placed.

The air which supports combustion enters the furnace from the end opposite to that at which the objects to be treated enters. Any suitable means for producing a current may be used.

In the normal working order of the oven the normal products of combustion escape toward the entrance of the oven while the air necessary for combustion enters at the exit of the oven and passes over the articles as they near the exit thereby cooling them off. The whole gaseous product of combustion in its longitudinal movement in the oven is retarded and given a circular motion by the flanges which act as radiating surfaces and as means for localizing the heat.

In order to assist in the longitudinal movement of the gases flanges 3 are as shown in Figure 3 inclined from bottom upward, in the direction of the entrance of the oven so that the combustion which takes place at 2 in the cavity formed by flanges 3 suck up the gaseous mass from the oven toward the top by a system of longitudinal movement.

After the gas has entered through cavities 2 where combu-stion takes place and hot gases are produced, the hot gases pass up the sides of the oven between the flanges 3 and are more or less concentrated in the upper part of the oven and therefrom force down upon and around the content to be dried. The flanges 3 serve to localize and equalize the heat and direct it down upon the contents; The process-of` drying is effected by the hot gas coming' indirect contact with the articles.

In the form shown in Fig. Ll the vgeneralv construction ot the lianges is the saine as that shown in theifother `figures but the flanges are prolonged below the level ot the bottom of the oven. The hot burning gases coniing in enter the oven through openings (l, pass upl through the flanges over and around the articles treated and back down throughlconduit 7. This forni of oven is especially used for annealing purposes.

y The outside surfaces ot the kilnwall are indicated inFigs. 1`, 3 and 4, by the' light lines.` The outside body of the wa'll'ni'ay be' built up ot' any suitable material that has av non-heat conducting quality.

Having 1i0w` particularly describediniy invention, the natur'eof'its structure andniairv ner of; its operation, what I claim' i s":

l. Iua'tuiineloven, an oven body, a series of flanges arranged within and extending across the top of the body gas' conduits leading into thez oven and betwfee'nv the Hang-es.

2. In a tunnel oven, ar tunnel body, `a series of flanges arranged within and eX- tending across the top of the tunnel body, gas conduits leading into'the tunnel.

3. In a tunnel oven, a passageway therethrough for objects to be treated, a series ot flanges extending ove and across the passageway and providing combustion chainbers and loralizingn'iean's for the products of combustion, a conduit leading into the 'combustion chamber.

il.. In a tunnel oven, a passage-way therethrough 'li'or objects to be treated, a series ot flanges extending over and across said-pas sage-way and providing combustion chainbe'rs andI localizing' ineans for the products ot'coinl'iustion, a gas conduit"leading into 'the' eoinbust'on chamber, the lower part otv each flange being hollowe'd out to forni conduits whereby the gas may pass freni' on'e cavity to the other.

In a tunnel oven having ap'assage-way therethrougli, a series of flanges extending" over and across the passage-way andy proJ riding combustion chambers, the lower part ot said Atlanges being hollowed out to perinit the productso'f combustion to pass'fr'orn' one chamber to another. p

In testimony whereof I afX rny' signature.

HENRI FRANCAIRT. 

